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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin:0;
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        td{
            text-align: center;
            }
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<body>
<table border="2px" cellpadding="20px" cellspacing="10px" width="800" align="center">
<tr>
    <th>周一</th>
    <th>周二</th>
    <th>周三</th>
    <th>周四</th>
</tr>
<tr>
    <td rowspan="2">数学1</td>
    <td>语文1</td>
    <td>英语1</td>
    <td>美术1</td>
</tr>
<tr>
    <td>数学2</td>
    <td>语文2</td>
    <td>英语2</td>
    <td>美术2</td>
</tr>
<tr>
    <td>数学3</td>
    <td colspan="2">语文3</td>
    <td>英语3</td>
    <td>美术3</td>
</tr>
</table>
</body>
</html>